:sig
StringList StringList::unique() const

:params
return value : a new `StringList` containing each distinct string once

:content
Returns a copy of the list with duplicate strings removed. The first occurrence of each string is kept, so the result preserves first-seen order.

:example
StringList routes = split("dashboard,index,dashboard,themes", ",");
StringList unique_routes = routes.unique();
print(join(unique_routes, ","), "\n");

:see
>types
0_StringList
2_StringList_sort
2_StringList_find
join